The UV LED heterostructures have been obtained by HVPE approach and investigated by XRD, AFM and PL methods. The experiment shows that the peak wavelength of UV LEDs is in the range of 360-365 nm with FWHM of 10-13 nm. At operating current of 20 rnA the active region temperature Tj is 43°C, the output optical power and efficiency -1.14 mW and 1.46 %, respectively. It is presented a model based on corpuscular Monte Carlo method in order to calculate the light extraction index. The simulation results allow us to propose the ways to increase the efficiency of UV LEDs by 3-4 times: surface interfaces texturing, optimization of the design of heterostructures, and the use of lenses.
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